/**
 * Modern Sidebar Styles - Collapsible & Responsive
 * Supports expanded (280px) and collapsed (72px) states
 */

/* ═══════════════════════════════════════════════════════════
   SIDEBAR CONTAINER
   ═══════════════════════════════════════════════════════════ */

.sidebar-modern {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  border-right: 1px solid var(--border-primary);
  display: flex;
  flex-direction: column;
  z-index: var(--z-sidebar);
  transition: width var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.sidebar-modern.collapsed {
  width: var(--sidebar-collapsed-width);
}

/* ═══════════════════════════════════════════════════════════
   TOGGLE BUTTON
   ═══════════════════════════════════════════════════════════ */

.sidebar-toggle-btn {
  position: absolute;
  right: -12px;
  top: 20px;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  background: var(--surface-primary);
  border: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-md);
}

.sidebar-toggle-btn:hover {
  background: var(--accent-primary);
  border-color: var(--accent-primary);
  transform: scale(1.1);
}

.sidebar-toggle-btn:hover .icon-chevron {
  color: white;
}

.sidebar-toggle-btn .icon-chevron {
  width: 16px;
  height: 16px;
  color: var(--text-tertiary);
  transition: transform var(--transition-base), color var(--transition-fast);
}

.sidebar-modern.collapsed .sidebar-toggle-btn .icon-chevron {
  transform: rotate(180deg);
}

/* ═══════════════════════════════════════════════════════════
   BRAND SECTION
   ═══════════════════════════════════════════════════════════ */

.sidebar-brand-modern {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--border-primary);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.05), rgba(99, 102, 241, 0.05));
  min-height: 72px;
  transition: all var(--transition-base);
}

.brand-logo-container {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  box-shadow: 0 4px 14px rgba(34, 211, 238, 0.3);
  transition: all var(--transition-base);
}

.sidebar-modern:hover .brand-logo-container {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(34, 211, 238, 0.4);
}

.brand-logo-svg {
  width: 24px;
  height: 24px;
}

.brand-text-modern {
  display: flex;
  flex-direction: column;
  gap: 2px;
  opacity: 1;
  transition: opacity var(--transition-fast);
  min-width: 0;
  flex: 1;
}

.sidebar-modern.collapsed .brand-text-modern {
  opacity: 0;
  pointer-events: none;
}

.brand-name-modern {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-tagline-modern {
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION MENU
   ═══════════════════════════════════════════════════════════ */

.nav-menu-modern {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
  overflow-x: hidden;
}

.nav-menu-modern::-webkit-scrollbar {
  width: 4px;
}

.nav-menu-modern::-webkit-scrollbar-track {
  background: transparent;
}

.nav-menu-modern::-webkit-scrollbar-thumb {
  background: var(--border-secondary);
  border-radius: var(--radius-full);
}

.nav-menu-modern::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

.nav-list-modern {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* ═══════════════════════════════════════════════════════════
   NAVIGATION ITEMS
   ═══════════════════════════════════════════════════════════ */

.nav-item-modern {
  position: relative;
}

.nav-link-modern {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

/* Hover Effect */
.nav-link-modern::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--accent-gradient);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: height var(--transition-base);
}

.nav-link-modern:hover {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.08), rgba(99, 102, 241, 0.04));
  color: var(--text-primary);
}

.nav-link-modern:hover::before {
  height: 24px;
}

/* Active State */
.nav-link-modern.active {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(99, 102, 241, 0.08));
  color: var(--accent-primary);
  font-weight: var(--font-semibold);
  box-shadow: var(--shadow-sm);
}

.nav-link-modern.active::before {
  height: 32px;
}

/* Icon Container */
.nav-icon-modern {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.1), rgba(99, 102, 241, 0.05));
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.nav-link-modern:hover .nav-icon-modern,
.nav-link-modern.active .nav-icon-modern {
  background: var(--accent-gradient);
  box-shadow: 0 4px 12px rgba(34, 211, 238, 0.3);
  transform: scale(1.05);
}

.nav-icon-modern svg {
  width: 20px;
  height: 20px;
  color: var(--accent-primary);
  transition: color var(--transition-fast);
}

.nav-link-modern:hover .nav-icon-modern svg,
.nav-link-modern.active .nav-icon-modern svg {
  color: white;
}

/* Label */
.nav-label-modern {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.sidebar-modern.collapsed .nav-label-modern {
  opacity: 0;
  width: 0;
}

/* Badge (optional notification badge) */
.nav-badge-modern {
  min-width: 20px;
  height: 20px;
  padding: 0 var(--space-2);
  background: var(--color-danger);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  border-radius: var(--radius-full);
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.nav-badge-modern:not(:empty) {
  display: flex;
}

.sidebar-modern.collapsed .nav-badge-modern {
  opacity: 0;
}

/* ═══════════════════════════════════════════════════════════
   DIVIDER
   ═══════════════════════════════════════════════════════════ */

.nav-divider-modern {
  margin: var(--space-4) 0;
}

.nav-divider-modern hr {
  border: none;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-primary), transparent);
}

/* ═══════════════════════════════════════════════════════════
   SIDEBAR FOOTER
   ═══════════════════════════════════════════════════════════ */

.sidebar-footer-modern {
  padding: var(--space-4);
  border-top: 1px solid var(--border-primary);
  background: linear-gradient(180deg, transparent, rgba(34, 211, 238, 0.03));
}

.system-status-modern {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.status-indicator-modern {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(34, 211, 238, 0.05));
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.status-dot-modern {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: var(--text-disabled);
  flex-shrink: 0;
  transition: all var(--transition-base);
}

.status-dot-modern.online {
  background: var(--color-success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2), 0 0 8px rgba(16, 185, 129, 0.4);
  animation: pulse-status 2s ease-in-out infinite;
}

@keyframes pulse-status {
  0%, 100% {
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2), 0 0 8px rgba(16, 185, 129, 0.4);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(16, 185, 129, 0.15), 0 0 12px rgba(16, 185, 129, 0.3);
  }
}

.status-text-modern {
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.sidebar-modern.collapsed .status-text-modern {
  opacity: 0;
}

.status-details-modern {
  padding-left: var(--space-3);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  opacity: 1;
  transition: opacity var(--transition-fast);
}

.sidebar-modern.collapsed .status-details-modern {
  opacity: 0;
  display: none;
}

/* ═══════════════════════════════════════════════════════════
   MOBILE OVERLAY
   ═══════════════════════════════════════════════════════════ */

.sidebar-overlay-modern {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: calc(var(--z-sidebar) - 1);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.sidebar-overlay-modern.active {
  opacity: 1;
  pointer-events: auto;
}

/* ═══════════════════════════════════════════════════════════
   TOOLTIPS (for collapsed state)
   ═══════════════════════════════════════════════════════════ */

.sidebar-modern.collapsed .nav-link-modern {
  position: relative;
}

.sidebar-modern.collapsed .nav-link-modern::after {
  content: attr(title);
  position: absolute;
  left: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  padding: var(--space-2) var(--space-3);
  background: var(--surface-primary);
  color: var(--text-primary);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
  z-index: 1000;
}

.sidebar-modern.collapsed .nav-link-modern:hover::after {
  opacity: 1;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE BEHAVIOR
   ═══════════════════════════════════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
  .sidebar-modern {
    transform: translateX(-100%);
  }

  .sidebar-modern.open {
    transform: translateX(0);
  }

  .sidebar-toggle-btn {
    display: none; /* Hide collapse button on mobile */
  }
}

/* Mobile */
@media (max-width: 768px) {
  .sidebar-modern {
    width: 280px;
    box-shadow: var(--shadow-2xl);
  }

  .sidebar-modern.collapsed {
    width: 280px; /* Don't collapse on mobile */
  }

  .nav-icon-modern {
    width: 36px;
    height: 36px;
  }

  .nav-icon-modern svg {
    width: 18px;
    height: 18px;
  }

  .brand-logo-container {
    width: 36px;
    height: 36px;
  }

  .brand-logo-svg {
    width: 20px;
    height: 20px;
  }
}

/* ═══════════════════════════════════════════════════════════
   ACCESSIBILITY
   ═══════════════════════════════════════════════════════════ */

.nav-link-modern:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

.sidebar-toggle-btn:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .sidebar-modern,
  .sidebar-toggle-btn,
  .nav-link-modern,
  .nav-icon-modern,
  .brand-logo-container,
  .status-dot-modern {
    transition: none;
    animation: none;
  }
}

/* Dark mode specific adjustments */
[data-theme="dark"] .sidebar-modern {
  background: linear-gradient(180deg, #0f1419 0%, #1a1f2e 100%);
  box-shadow: 4px 0 30px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .sidebar-toggle-btn {
  background: var(--surface-secondary);
}

[data-theme="dark"] .nav-link-modern:hover {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.15), rgba(99, 102, 241, 0.08));
}

[data-theme="dark"] .nav-link-modern.active {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.2), rgba(99, 102, 241, 0.12));
}